Adiabatic Compressibility of Aqueous Solutions of Amphiphiles with an Ammonium Group as the Hydrophilic Domain
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概要
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The apparent molar volume and the apparent molar adiabatic compression of aqueous solutions of n-alkylammonium bromide (CnH2n+1NH3Br; n=1-8, 10) and n-alkyltrimethylammonium bromide (CnH2n+1N(CH3)3Br; n=1, 8, 10) were measured using a vibration-tube density meter and a sing-around ultrasound velocity meter at 5°C, and the partial molar volume and the partial molar adiabatic compression at infinite dilution (φV0 and φK0) were evaluated. It was confirmed that φK0 linearly decreased with increasing alkyl chain length while φV0 linearly increased. Differences of φK0 between CnH2n+1NH3Br and CnH2n+1N(CH3)3Br with the same alkyl chain were negligibly small, which was in good agreement with the fact that the successive N-methylation of ammonium cation had only a little effect on compression. These results could be interpreted in terms of the compensation between the increase of hydrophobic hydration and the decrease of electrostriction of water around the ammonium group, leading the net compression being almost constant. When the amphiphiles with an octyl or a decyl group form micelles above their critical micelle concentration, on the contrary, the adiabatic compression of CnH2n+1NH3Br was distinctly larger than that of CnH2n+1N(CH3)3Br. The reason for the difference in compression of these micelles was discussed concerning the counter ion binding and the aggregation number.
- 日本油化学会の論文
- 2002-02-01
著者
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Kato Takayoshi
Reseach Institute Of Electronics Shizuoka University
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藤井 稔
神戸大院工
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KATO Tadashi
Department of Anesthesiology, Nagoya Kyoritsu Hospital
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FUKADA Kazuhiro
Department of Applied Biological Science, Faculty of Agriculture, Kagawa University
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FUJII Masatoshi
Department of Chemistry, Tokyo Metropolitan University
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Kato T
Kyushu Inst. Of Technol. Fukuoka Jpn
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Fujii Masatoshi
Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University
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LI Jinhua
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
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SEIMIYA Tsutomu
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University
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Li Jinhua
Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University
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Seimiya Tsutomu
Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University
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Kato Tadashi
Tohoku Pioneer Co.
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Fukada Kazuhiro
Department Of Applied Biological Science Faculty Of Agriculture Kagawa University
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Kato Tadashi
Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University
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Kato Tadashi
Department Of Anesthesiology Nagoya Kyoritsu Hospital
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Fukada Kazuhiro
Department of Biochemistry and Food Science, Kagawa University
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Seimiya Tsutomu
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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